电子水平仪升级完毕提升四功能：
1，外观造型饱满富有质感。
2，显示屏增加背光灯。
3，电池仓添加手动旋钮便于更换电池。
4，电池升为18650锂电池待机10个工作日。
The electronic level has been upgraded to enhance four functions:
1. The appearance is full and textured.
2. Add backlight to the display screen.
3. Add a manual knob to the battery compartment for easy battery replacement.
4.Upgrade the battery to 18650 lithium battery and standby for 10 working days.
